You'll forget you're wearing them.Most sunglasses will perform well during the first two or three miles of an intense hike or trail run/ but seven or eight miles of intense moving will really separate the wheat from the chaff. In order for a pair of sunglasses to perform during the entirety of your run or hike/ they need to be specifically designed to do so/ and the Bliz Force Sunglasses with Bonus Lenses most certainly are.Details: Bliz Hydro Lens Technology/UV protection/Adjustable nose pads/Removable sweat barBrand: BlizCategory: EyewearColour: Shiny White / Black/Smoke W Silver Mirror - OrangeManufacturer Style No.QU12KP5243